Multiple phase power supply having current shared power factor correction
a power factor correction and multi-phase technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of unbalanced current sharing between each power supply, loop is prone to oscillation, and single-phase power supply system is limited in power outpu
Active Publication Date: 2012-07-17
GATESAIR
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Benefits of technology
"The present invention provides a multi-phase power supply with current shared power factor correction. This includes N input rectifier filters, each receiving a different one of an N phase AC input signal, and providing a rectified signal. N single phase power factor correction pre-regulators receive the rectified signals and provide a regulated signal. A current sharing N way to single way multiplexing switch network receives the regulated signals and provides a single output signal. A single DC-to-DC converter receives the single output signal and supplies a DC output signal to a load. The technical effect of this invention is to provide a more efficient and reliable power supply for multiple loads with reduced power loss and improved power factor correction."
Problems solved by technology
The feedback loop is prone to oscillation and the current sharing between each power supply is, therefore, unbalanced.
This drive is required for a larger output power capability and additional system cost.
Method used
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[0020]In the above description relative to FIGS. 1 and 2, a discussion was had of the prior art respecting the use of multiple DC-to-DC converters, along with a current sharing circuit, for supplying current to a load from a three phase AC input. In accordance with the present invention as will be described below relative to the embodiment presented in FIGS. 3 and 4, the invention is presented with a true current sharing circuit employing a three-to-one multiplexing switch in the embodiment presented in conjunction with three single-phase power factor pre-regulators which will balance the supply current from each single phase power factor pre-regulator. The single phase power factor pre-regulator, in itself, is a well known technology.
[0021]As presented in FIG. 3, this embodiment of the invention, like that in FIG. 2 of the prior art, employs three rectifier filters, 10A, 10B and 10C. Additionally, as in the prior art of FIG. 2, this embodiment employs three PFC pre-regulators 12A, ...
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A multi-phase (N) power supply is presented having current shared power factor correction. This includes N input rectifier filters each receiving a respective different one of an N phase AC input signal and providing therefrom one of N rectified signals. N single phase power factor correction pre-regulators each receive a respective different one of the rectified signals and provide therefrom a regulated signal. A current sharing N way to single way multiplexing switch network receives the N regulated signals and provides therefrom a single output signal.
Description
BACKGROUND OF THE INVENTION[0001]1. Technical Field[0002]The present invention is directed to the art of power supply systems and, more particularly, to improvements relating to multiple phase power line power supplies having current shared power factor correction.[0003]2. Description of the Prior Art[0004]Low power line disturbance power supply is becoming a preferred power supply for all new electronic circuits. A low power line disturbance power supply generates very small harmonic current feedbacks to the power grid.[0005]The common technique that is employed today is called power factor correction (PFC), where a boost regulator (PFC pre-regulator) is used to pre-regulate the output voltage while forcing the input current to be sinusoidal and also in phase with the input line voltage. When the voltage and current are in phase, the power factor (PF) can be approaching unity and therefore, the real power is equal to the apparent power. This technique is called Active Power Factor ...
Claims
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IPC IPC(8): H02M7/08G05F1/00
CPCH02J1/102H02M1/4216H02M7/23H02M2001/4283Y02B70/126H02M1/4283Y02B70/10Y02P80/10
Inventor LUU, KY THOAI
Owner GATESAIR